This is an ordinary coding error, not OpenGL-related. The compiler says it can't perform implicit conversion between a string (char array) and a LPCCWSTR.

I would've told you what to do if I knew WinAPI, but I don't, as I prefer sticking to cross-platform code.

By the way, dude, this isn't your first thread like this. Get a C/C++ tutorial and learn the language properly first so that at least you can understand the compiler error messages, then start tinkering with OpenGL.